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40 Gallon Heater
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Plumbing (52)
Next-Day Delivery*
Yes (52)
Price
Between $500 and $999.99 (33)
More than $1000 (19)
Subscription Eligible
Yes (13)
Brand
A. O. Smith (18)
Noritz (2)
Rheem (32)
Product Weight
75 lb. (2)
91 lb. (1)
92 lb. (2)
96 lb. (2)
97 lb. (1)
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106 lb. (2)
109 lb. (1)
118 lb. (2)
120 lb. (2)
124 lb. (1)
125 lb. (6)
127 lb. (5)
130 lb. (3)
135 lb. (3)
138 lb. (2)
140 lb. (2)
147 lb. (1)
155 lb. (1)
157 lb. (1)
170 lb. (1)
174 lb. (1)
178 lb. (2)
224 lb. (1)
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Product Width
18 in. (7)
18.5 in. (1)
18.25 in. (2)
19 in. (6)
19.25 in. (2)
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19.75 in. (4)
20 in. (3)
20.5 in. (1)
20.25 in. (4)
21 in. (3)
21.3 in. (2)
21.5 in. (1)
21.75 in. (2)
21.375 in. (1)
22 in. (3)
23 in. (2)
24 in. (1)
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Product Height
31.75 in. (1)
36.8 in. (2)
48.25 in. (3)
49.75 in. (1)
50.25 in. (1)
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51.5 in. (1)
52.125 in. (2)
53.25 in. (1)
53.875 in. (1)
54 in. (1)
57.375 in. (1)
58 in. (1)
58.5 in. (1)
58.25 in. (2)
59 in. (1)
60.75 in. (4)
60.875 in. (1)
61.5 in. (7)
61.25 in. (1)
61.75 in. (4)
62 in. (1)
62.5 in. (1)
63 in. (1)
64 in. (2)
66.88 in. (1)
67.375 in. (2)
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Tank Capacity
40 gal. (43)
Product Depth
17.6 in. (2)
18 in. (5)
18.5 in. (1)
18.25 in. (2)
19 in. (6)
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19.25 in. (2)
19.75 in. (4)
20 in. (3)
20.5 in. (1)
20.25 in. (4)
21 in. (2)
21.5 in. (1)
21.75 in. (2)
21.375 in. (1)
22 in. (3)
23 in. (2)
24 in. (1)
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Water Heater Type
Lowboy (1)
Medium (4)
Regular (2)
Short (6)
Tall (23)
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Water Connection Size
3/4 in. (34)
Energy Factor
0.6 (1)
0.7 (1)
0.55 (2)
0.57 (1)
0.58 (1)
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0.59 (4)
0.61 (1)
0.62 (1)
0.64 (1)
0.65 (3)
0.67 (1)
0.68 (1)
0.69 (1)
0.87 (1)
0.92 (5)
0.93 (3)
0.94 (1)
0.57999999999999996 (3)
3.83 (1)
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BTU Heat Rating
34,000 (1)
35,500 (1)
36,000 (1)
38,000 (7)
40,000 (9)
Show more
42,000 (1)
30000 (1)
31000 (1)
34000 (1)
36000 (4)
38000 (3)
40000 (2)
120000 (1)
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Vent Type
Atmospheric (9)
Direct Vent (3)
Per Local Building Codes (8)
Power Vent (4)
Single Wall (1)
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Gallons Per Hour Recovery
21 (3)
30.3 (1)
34.3 (1)
36 (1)
36.4 (2)
Show more
38 (1)
38.4 (1)
40 (1)
40.4 (2)
41 (8)
42 (1)
45 (2)
400 (1)
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Gas Type
Natural Gas (20)
Propane (1)
Temperature Pressure Relief Valve
Yes (17)
Water Connection Location
Side (1)
Side, Top (1)
Top (14)
Pilot Reset Button
Yes (13)
Voltage
120 V (1)
240 (10)
Minimum Working Temperature
40 F (1)
45 F (9)
Commercial/Residential
Commercial/Residential (1)
Residential (8)
Phase
Single (9)
Amperage
18.75 (3)
19 (3)
Product Diameter
18 in. (1)
20.5 in. (1)
20.25 in. (1)
24 in. (1)
Wattage
4500 (3)
Features
Temperature Pressure Relief Valve,Demand Response Ready (1)
Temperature Pressure Relief Valve,Overheat Protection (1)
Gas Connection Size
1/2 in. (1)
Color
Beige (1)
TAA/BAA Compliant
Yes (52)
GSA Approved
No (45)
Yes (7)
Made in the USA
No (16)
Yes (36)
ADA Approved
No (52)
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PART
754129
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A. O. Smith® 40-Gallon Medium Electric Water Heater 20 1/2"d X 50"h
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754138
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A. O. Smith® 40-Gallon Tall Natural Gas Water Heater 18" D X 61-3/4" H
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754128
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A. O. Smith® 40-Gallon Tall Electric Water Heater 18"d X 61-1/4" H
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PART
215598
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Rheem 40 Gallon 38,000 Btu Natural Gas Water Heater, Side T And P Relief Valve
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PART
119169
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A. O. Smith® Proline Ultra-Low Nox 40 Gallon Tall Natural Gas Water Heater
$806.93
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PART
730080
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A. O. Smith® 40-Gallon Lowboy Electric Water Heater Side Connect 24d X 31-3/4"h
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PART
754135
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A. O. Smith® 40-Gallon Short Natural Gas Water Heater 20" D X 51-1/2" H
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PART
249273
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A. O. Smith® 40-Gallon Tall Electric Grid-Capable Water Heater 20" D X 60.25" H
$697.00
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PART
215590
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Rheem 40 Gal. Medium 6 Year 240-Vac 4500-Watt Electric Water Heater
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PART
249274
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A. O. Smith® 40-Gallon Short Electric Grid-Capable Water Heater 20.5" D X 49.75" H
$709.00
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PART
287698
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Rheem Pro Classic 40 Gal. 36k Btu Ultra Low Nox Power Vent Natural Gas Heater
$2,542.19
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PART
754145
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A. O. Smith® 40-Gallon Tall Ultra-Low-Nox Gas Water Heater 18" X 61-3/4"
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PART
288488
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Noritz 40 Gal. 0.5-6.6 Gpm Replacement Tank Liquid Propane Gas Tankless Water Heater Kit
$1,408.69
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PART
754148
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A. O. Smith® 40-Gallon Direct Vent Natural Gas Water Heater
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PART
834318
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A. O. Smith® Proline® 40 Gallon Direct Vent Tall Natural Gas Water Heater
$1,857.00
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PART
754161
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A. O. Smith® 40-Gallon Power Direct Vent Natural Gas Water Heater
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PART
754143
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A. O. Smith® 40-Gallon Tall Propane -Lp- Water Heater 18" D X 61-3/4" H
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PART
754158
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A. O. Smith® 40-Gallon Power Vent Ultra Low Nox Natural Gas Water Heater
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PART
730052
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A. O. Smith® 40-Gallon Tall Natural Gas Water Heater With Top T/p 18d X 61-3/4"h
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PART
754152
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A. O. Smith® 40-Gallon Power Vent Natural Gas Water Heater
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PART
730065
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A. O. Smith® 40-Gallon Tall Low-Btu Natural Gas Water Heater 20" D X 61-3/4" H
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PART
754136
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A. O. Smith® Promax® 18 X 61.75 In. 40 Gal. Tall W/ Side Taps Natural Gas Water Heater
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PART
288195
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Rheem Professional Classic 40 Gal. 240v 3500w Tall Electric Water Heater
$591.89
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PART
290352
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Rheem Professional Classic 40 Gal. 240v 3500w Residential Electric Water Heater
$616.09
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